Bring a large pot of salted water to a boil.
Cook the pasta according to package instructions until al dente.
Drain and set aside.
Heat olive oil in a large skillet over medium heat.
Add chopped shallots, sliced leek, and minced garlic.
Sauté for 2-3 minutes until the vegetables are soft and fragrant.
Add ground turkey to the skillet with the vegetables.
Cook until the turkey is browned and no longer pink, breaking it up with a spoon.
This takes about 5-7 minutes.
Add sage leaves and heavy cream to the skillet.
Reduce the heat to low and simmer for about 5 minutes, allowing the flavors to meld together.
Combine the cooked pasta with the turkey sauce in the skillet.
Stir well to coat the pasta evenly with the sauce.
Finish by adding the lemon zest and Parmesan cheese, then mix gently.